Liu, Xiaoxue MM; Li, Chongwei MM
From the Department of Rheumatology and Immunology, Tianjin Children's Hospital, Tianjin, China.
The authors declare no conflict of interest.
Correspondence: Chongwei Li, MM, Department of Rheumatology and Immunology, Tianjin Children's Hospital, Tianjin 300134, China. E-mail: [email protected].
